CN103882181B - Manganese-containing steel alloying process - Google Patents
Manganese-containing steel alloying process Download PDFInfo
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- CN103882181B CN103882181B CN201210560459.8A CN201210560459A CN103882181B CN 103882181 B CN103882181 B CN 103882181B CN 201210560459 A CN201210560459 A CN 201210560459A CN 103882181 B CN103882181 B CN 103882181B
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- 239000011572 manganese Substances 0.000 title claims abstract description 113
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 105
- 239000010959 steel Substances 0.000 title claims abstract description 105
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 229910052748 manganese Inorganic materials 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000005275 alloying Methods 0.000 title abstract description 18
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000002893 slag Substances 0.000 claims abstract description 30
- 238000010079 rubber tapping Methods 0.000 claims abstract description 22
- 229910052786 argon Inorganic materials 0.000 claims abstract description 17
- 238000007664 blowing Methods 0.000 claims abstract description 15
- 238000007670 refining Methods 0.000 claims abstract description 14
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 11
- 239000000956 alloy Substances 0.000 claims abstract description 11
- 238000009628 steelmaking Methods 0.000 claims abstract description 11
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims abstract description 6
- 239000007788 liquid Substances 0.000 claims description 14
- 229910000640 Fe alloy Inorganic materials 0.000 claims description 10
- 229910000914 Mn alloy Inorganic materials 0.000 claims description 8
- 229910000840 Capped steel Inorganic materials 0.000 claims description 5
- QCJQWJKKTGJDCM-UHFFFAOYSA-N [P].[S] Chemical compound [P].[S] QCJQWJKKTGJDCM-UHFFFAOYSA-N 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 2
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 2
- 239000011574 phosphorus Substances 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 238000011112 process operation Methods 0.000 abstract 1
- 238000003756 stirring Methods 0.000 abstract 1
- 229910052717 sulfur Inorganic materials 0.000 abstract 1
- 239000011593 sulfur Substances 0.000 abstract 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 18
- 238000003723 Smelting Methods 0.000 description 15
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 14
- 239000001301 oxygen Substances 0.000 description 14
- 229910052760 oxygen Inorganic materials 0.000 description 14
- 238000011084 recovery Methods 0.000 description 13
- 230000002829 reductive effect Effects 0.000 description 12
- 239000003795 chemical substances by application Substances 0.000 description 10
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 8
- 238000002844 melting Methods 0.000 description 7
- 230000008018 melting Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 229910000616 Ferromanganese Inorganic materials 0.000 description 5
- 229910000720 Silicomanganese Inorganic materials 0.000 description 5
- DALUDRGQOYMVLD-UHFFFAOYSA-N iron manganese Chemical compound [Mn].[Fe] DALUDRGQOYMVLD-UHFFFAOYSA-N 0.000 description 5
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 4
- 235000011941 Tilia x europaea Nutrition 0.000 description 4
- 238000010891 electric arc Methods 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 4
- 239000004571 lime Substances 0.000 description 4
- 239000000155 melt Substances 0.000 description 4
- 229910052757 nitrogen Inorganic materials 0.000 description 4
- 238000005453 pelletization Methods 0.000 description 4
- 229910000655 Killed steel Inorganic materials 0.000 description 3
- 235000006679 Mentha X verticillata Nutrition 0.000 description 3
- 235000002899 Mentha suaveolens Nutrition 0.000 description 3
- 235000001636 Mentha x rotundifolia Nutrition 0.000 description 3
- 229910018657 Mn—Al Inorganic materials 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 3
- 238000005262 decarbonization Methods 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 2
- AMWRITDGCCNYAT-UHFFFAOYSA-L hydroxy(oxo)manganese;manganese Chemical compound [Mn].O[Mn]=O.O[Mn]=O AMWRITDGCCNYAT-UHFFFAOYSA-L 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 229910018619 Si-Fe Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910008455 Si—Ca Inorganic materials 0.000 description 1
- 229910008289 Si—Fe Inorganic materials 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910003465 moissanite Inorganic materials 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a manganese-containing steel alloying process, which comprises the following steps of 1) baking a steel ladle: selecting manganese ore blocks with the particle size of 10-50mm and the phosphorus and sulfur content of less than 0.05 percent, adding the manganese ore blocks into a steel ladle according to the middle limit of the manganese content, baking the steel ladle at the temperature of more than 1000 ℃, keeping the temperature for more than 2 hours, and covering a steel ladle cover in the transmission process after baking; 2) and (3) converter operation: the tapping temperature is carried out according to the middle and upper limits, the molten steel temperature is 1685-1705 ℃, the molten steel temperature in a steel ladle is ensured to be not lower than 1670 ℃, the end point carbon content is more than 0.08%, the slag discharging amount of a converter is controlled, the slag thickness is less than 50mm, and the bottom argon blowing operation of the steel ladle is carried out after tapping; 3) and (3) refining operation of an LF furnace: and (3) adopting strong stirring treatment, controlling the flow of argon gas to be not less than 250NL/min according to the upper limit of the refining target temperature, and simultaneously adding other alloys to adjust the components of molten steel to meet the requirements of steel grades. The invention has simple process operation, does not need to improve the original equipment, does not influence other production operations, can obviously reduce the steelmaking cost, and can lead the yield of manganese in the manganese ore to reach more than 90 percent.
Description
Technical field
The invention belongs to technical field of smelting, particularly a kind of process for making adopting manganese ore alloying.
Background technology
Manganese is main alloy element in ferrous materials, has important effect for raising steel performance, when manganese element alloying is carried out in steel-making usually, adopts iron alloy such as ferromanganese, ferro-silico-manganese etc. containing manganese to carry out alloying of manganese in tapping or refining process.The technique that this employing including Mn-Fe alloy carries out alloying is very ripe, the rate of recovery of manganese is high and stable, but Smelting Plant need be become including Mn-Fe alloy, but the process manufacturing including Mn-Fe alloy is the process of a high energy consumption, high pollution, finally causes STEELMAKING PRODUCTION cost to increase and environmental pollution.
For above-mentioned shortcoming; when carrying out alloying of manganese at present; some steel-making enterprise adds manganese ore and carries out alloying of manganese in steel melting furnace; but the recovery rate of manganese is lower, is only 40%-60%, and after adding manganese ore in steel melting furnace, the oxidisability of slag is improved; lining erosion is serious; in addition usually also will coordinate two slag or duplex technique, therefore comprehensive cost is higher, is difficult to realize industrialization.
Patent " duplex steelmaking technique of revolving furnace ", (publication number: CN101294230A) discloses a kind of duplex steelmaking technique of revolving furnace, and in decarbonizing furnace, use manganese ore to carry out alloying.Converter smelting comprises dephosphorization technology and decarbonization process, converter smelting completes in two converters, wherein dephosphorization technology completes in converter I, decarbonization process completes in converter II, manganese ore can be added to regulate thermal equilibrium and to improve terminal Fe content in decarbonization process, the consumption of tapping process manganeseirom can be reduced, more outstanding to the smelting superiority of high mangaenese steel, ultra-low phosphoretic steel etc., reduce smelting cost.This invention can save iron alloy containing manganese as the consumption such as ferromanganese, ferro-silico-manganese.But adopt duplex technique, need equipment support, dephosphorization converter and decarburization converter must be had to coordinate, and for the enterprise not having duplex processing unit, be obviously not suitable for, application limitation is larger; In addition, the problem that manganese ore inevitably brings aggravation lining erosion is added in steel melting furnace.
Patent " a kind of production technique of C-Mn-Al killed steel ", (publication number: CN1966752A) discloses the production technique of the smelting C-Mn-Al killed steel adding manganese ore in a kind of converter.This technique adopts the converter of oxygen top bottom blowing to smelt C-Mn-Al killed steel.Blast-melted and steel scrap are joined by a certain percentage in converter, oxygen blast melting, adds slag making materials as lime.When in molten steel, [C], [P], [S] content reach in smelted steel grade standard-required forward direction molten steel and adds reductive agent and manganese ore, and control the Fe content of molten steel terminal and oxygen level well, top blowing oxygen autogenous cutting is changed into the blowing of top blast nitrogen, carry out argon bottom-blowing or bottom blowing operating under nitrogen simultaneously; In converter tapping process, in ladle molten steel, add reductor carry out pre-deoxidation, and add reductibility refining slag.It is that the alloying route cost of raw material is high and Mn series alloy production process energy consumption is high, pollute the problems such as large with Mn series alloy that this invention solves in existing process for making.But this technique due to the converter quantity of slag comparatively large, finishing slag oxidisability is high, and needing to consume relatively large reductive agent could be reduced to manganese by part manganese oxide in manganese ore, and usual recovery rate is lower, therefore has no industrial production and adopts.In addition due to top blast nitrogen, be not therefore suitable for steel grade nitrogen content being had to requirement.
Patent " a kind of Mn oxide DIRECT ALLOYING process for making ", (publication number: CN1470667A) discloses a kind of molten steel high temperature that utilizes and manganese direct melting from Mn oxide is reduced into manganese metal and molten steel is carried out to the method for DIRECT ALLOYING, this technique comprises Mn oxide is mixed with manganese alloy pelletizing, in electric furnace or converter tapping process, manganese alloy pelletizing is joined in molten steel in batches, molten steel high temperature is utilized manganese direct melting from Mn oxide to be reduced into manganese metal and to carry out DIRECT ALLOYING to molten steel, simultaneously by blowing hydrogen or other refining route to improve and the rate of recovery of stable manganese.To be the Mn oxide that is greater than 40% by Fe content become 50-200 object powder with addition of the reductive agent of 5-15%, 1-5% heat-generating agent, 1-2% catalyzer through crushing grinding to described manganese alloy pelletizing, then mixing to be made by binding agent, reductive agent is metal A l, Si, Ca etc., heat-generating agent is Al, SiC, Si-Fe, Si-Ca etc., catalyzer is gac etc.The advantage of this technique is to eliminate production process Smelting Plant being become including Mn-Fe alloy, thus significantly save energy and alleviate environmental pollution, also considerably reduce the production cost of molten steel alloying of manganese.But, although the method eliminates operation Smelting Plant being become manganeseirom, need manganese ore to coordinate with reductive agent, heat-generating agent and catalyzer etc. and make manganese alloy pelletizing to use, still there is complex process, shortcoming that cost is high.
According to thermodynamic principles, under the conventional smelting condition of converter, realize manganese ore direct Reducing and Alloying there is reality possibility, but traditional converter smelting quantity of slag is too large, the oxidisability of slag is too strong, the factors such as endpoint carbon content is too low all will reduce the recovery rate of manganese, general converter smelting manganese yield lower than 30% level, accordingly, if adopt two slag or duplex technique, although converter finishing slag amount can be reduced, but too increase smelting operation difficulty, add tap to tap time simultaneously, steel-making cost is increased, technique is connected and also can causes certain influence, in addition, the problem that manganese ore inevitably brings aggravation lining erosion is added in steel melting furnace.After molten steel directly adds manganese ore in addition, because value Mn oxide content usual in natural manganese ore is higher, as MnO
2, Mn
2o
3, these Mn oxides can be decomposed into Mn at a low price more than 930 DEG C
3o
4discharge oxygen with MnO simultaneously.Manganese ore adds molten steel due to its decomposes, and direct releasing oxygen, in molten steel, causes molten steel oxygen level sharply to increase, and this will significantly increase the consumption of reductive agent, and very easily causes steel inclusion to exceed standard.
Summary of the invention
The object of the invention is to solve above-mentioned prior art Problems existing, providing a kind of based on traditional converter smelting, realizing the process for making making manganese ore direct Reducing and Alloying.
The present invention is achieved in that the technique that this contains manganese alloy comprises following content:
1, ladle baking
1) select particle diameter at 10-50mm manganese ore block, manganese ore phosphorus sulphur content all requires to be less than 0.05%, and to prevent phosphorus in steel, sulphur exceeds standard,
2) add in ladle by described manganese ore, add-on can according to Fe content in manganese ore, by limit in institute's steelmaking kind requirement Fe content with addition of, to prevent manganese in steel from exceeding standard, but manganese ore weight may not exceed 20kg/ ton steel,
3) baking temperature of steel ladle is greater than 1000 DEG C, and more than 1000 DEG C temperature keep continuous more than 2 hours, to ensure that value Mn oxide compound fully decomposes, reduces oxygen and enters molten steel,
4) ladle baking terminate after transmitting procedure in, for avoid temperature reduce and process oxygen uptake, cause low price Mn oxide be again oxidized to value Mn oxide compound, ladle top needs capped steel clad;
2, converter operation
1) the scheme execution all routinely such as system, oxygen supply system, slagging regime is loaded,
2) tapping process can cause liquid steel temperature to reduce due to the manganese ore in ladle, require tapping temperature according in operation or work standard, the upper limit perform, liquid steel temperature controls between 1685 ~ 1705 DEG C,
3) in order to utilize in molten steel, C is to the reduction of manganese ore, and should ensure that in ladle, liquid steel temperature is not less than 1670 DEG C, endpoint carbon content controls more than 0.08%,
4), during tapping, the quantity of slag under strict control converter, slag is thick should lower than 50mm.
5), after tapping terminates, for ensureing that manganese ore fully contacts with molten steel, melts, reduces, improve manganese ore recovery rate further, need carry out the operation of ladle bottom blowing argon gas, argon flow amount performs by normal scheme;
3, LF stove refining operation
Ensureing under the prerequisite that electric arc arc stream is stable, adopt strong mixing process, argon flow amount is not less than 250NL/min, temperature controls according to the refining target temperature upper limit, if Fe content is lower than steel grade requirement in steel, should adds appropriate iron alloy such as ferromanganese, ferro-silico-manganese etc. containing manganese and adjust, the impact of the Hui Meng after consideration reductibility slag system is formed, for preventing manganese from exceeding standard, Fe content should control by steel grade lower limit, adds other alloy adjustment molten steel component simultaneously and meets steel grade requirement.
The present invention is based on conventional converter steelmaking process, on production not impact, first in ladle to be baked, appropriate manganese ore is added by manganese amount needed for steel grade, then toast, value Mn oxide compound is changed into Mn oxide at a low price and discharge the oxygen decomposing and produce simultaneously, avoid and cause the violent oxygenation of molten steel because adding manganese ore, then by normal process tapping, rely on C in steel to reduce to low price Mn oxide, without the need to additional reducing agent reduction Mn oxide, realize manganese ore direct Reducing and Alloying.
Adopt alloyage process of the present invention, solving in existing process for making is that the alloying route cost of raw material is high and Mn series alloy production process energy consumption is high, pollute the problems such as large with Mn series alloy, also solve adopt in two slag or duplex technique stove add that manganese ore causes that smelting operation difficulty is large, tap to tap time length, complex process, manganese yield is low and lining erosion is serious problem; The present invention removes Mn oxide in reduction manganese ore without the need to additionally adding the reductive agents such as aluminium, silicon, carbon, only can realize Mn oxide reduction by carbon in molten steel; Adopt technical solution of the present invention, in manganese ore, the recovery rate of manganese can reach more than 90%, and in addition, this technological operation is simple, does not need to improve original equipment, do not affect other production operation, significantly can reduce steel-making cost.
Embodiment
Below by embodiment, the present invention is described further.
Embodiment 1
Embodiment steel grade chemical composition is:
C:0.09%-0.15%;Si:0.12%-0.30%;Mn:0.25%-0.55%;P:≤0.04%;S:≤0.04%
1, ladle baking
1) select particle diameter at 15-40mm manganese ore block, manganese ore phosphorus sulphur content is all less than 0.05%,
2) in ladle, add manganese ore 700kg, be 100 tons of calculating according to tap, actual manganese ore add-on is 7kg/ ton steel,
3) baking temperature of steel ladle is 1050 DEG C, and reach 1050 DEG C for up to 2.5 hours,
4) ladle baking terminate after transmitting procedure in, ladle top capped steel clad;
2, converter operation
1) converter dress molten iron 90t, steel scrap 10t, blowing oxygen supply intensity is 3.44Nm
3/ mint, converting process is with addition of lime and other slag making materialses, and finishing slag basicity is 3.5,
2), during tapping, liquid steel temperature controls at 1690 DEG C,
3), after tapping terminates, in ladle, liquid steel temperature is 1672 DEG C, and endpoint carbon content is 0.12%,
4) quantity of slag under strict control converter, slag is thick is 45mm,
5), after tapping terminates, for ensureing that manganese ore fully contacts with molten steel, melts, reduces, improve manganese ore recovery rate further, carry out the operation of ladle bottom blowing argon gas, argon flow amount is 200NL/min;
3, LF stove refining operation
Ensureing under the prerequisite that electric arc arc stream is stable; adopt strong mixing process; argon flow amount is 250NL/min; liquid steel temperature is 1580 DEG C; because in steel, Fe content reaches 0.28%, meet the requirement of steel lower limit, therefore adjusted without the need to iron alloy such as ferromanganese, the ferro-silico-manganese etc. added containing manganese; add other alloy adjustment molten steel component to meet steel grade requirement, molten steel terminal composition is: C:0.10%; Si:0.15%; Mn:0.28%; P:0.015%; S:0.010%.
The final recovery rate analyzing manganese in manganese ore after testing reaches 95%.
Embodiment 2
Embodiment steel grade chemical composition is:
C:0.12%-0.20%;Si:0.12%-0.30%;Mn:0.30%-0.70%;P:≤0.045%;S:≤0.045%
1, ladle baking
1) select particle diameter at 20-45mm manganese ore block, manganese ore phosphorus sulphur content is all less than 0.05%,
2) in ladle, add manganese ore 1000kg, be 100 tons of calculating according to tap, actual manganese ore add-on is 10kg/ ton steel,
3) baking temperature of steel ladle is 1020 DEG C, and reach 1020 DEG C for up to 3 hours,
4) ladle baking terminate after transmitting procedure in, ladle top capped steel clad;
2, converter operation
1) converter dress molten iron 90t, steel scrap 10t, blowing oxygen supply intensity is 3.44Nm
3/ mint, converting process is with addition of lime and other slag making materialses, and finishing slag basicity is 3.8,
2), during tapping, liquid steel temperature controls at 1695 DEG C,
3), after tapping terminates, in ladle, liquid steel temperature is 1685 DEG C, and endpoint carbon content is 0.14%,
4) quantity of slag under strict control converter, slag is thick is 40mm,
5), after tapping terminates, for ensureing that manganese ore fully contacts with molten steel, melts, reduces, improve manganese ore recovery rate further, carry out the operation of ladle bottom blowing argon gas, argon flow amount is 200NL/min;
3, LF stove refining operation
Ensureing under the prerequisite that electric arc arc stream is stable; adopt strong mixing process; argon flow amount is 260NL/min; liquid steel temperature is 1582 DEG C; because in steel, Fe content reaches 0.42%, meet the requirement of steel lower limit, therefore adjusted without the need to iron alloy such as ferromanganese, the ferro-silico-manganese etc. added containing manganese; add other alloy adjustment molten steel component and meet steel grade requirement, molten steel terminal composition is: C:0.12%; Si:0.20%; Mn:0.42%; P:0.018%; S:0.011%.
The final recovery rate analyzing manganese in manganese ore after testing reaches 96%.
Embodiment 3
Embodiment steel grade chemical composition is:
C:0.12%-0.18%;Si:0.15%-0.30%;Mn:0.45%-0.80%;P:≤0.035%;S:≤0.035%
1, ladle baking
1) select particle diameter at 25-50mm manganese ore block, manganese ore phosphorus sulphur content is all less than 0.05%,
2) in ladle, add manganese ore 1000kg, be 100 tons of calculating according to tap, actual manganese ore add-on is 10kg/ ton steel,
3) baking temperature of steel ladle is 1015 DEG C, and reach 1015 DEG C for up to 3 hours,
4) ladle baking terminate after transmitting procedure in, ladle top capped steel clad;
2, converter operation
1) converter dress molten iron 90t, steel scrap 10t, blowing oxygen supply intensity is 3.40Nm
3/ mint, converting process is with addition of lime and other slag making materialses, and finishing slag basicity is 3.6,
2), during tapping, liquid steel temperature controls at 1690 DEG C,
3), after tapping terminates, in ladle, liquid steel temperature is 1680 DEG C, and endpoint carbon content is 0.13%,
4) quantity of slag under strict control converter, slag is thick is 40mm,
5), after tapping terminates, for ensureing that manganese ore fully contacts with molten steel, melts, reduces, improve manganese ore recovery rate further, carry out the operation of ladle bottom blowing argon gas, argon flow amount is 200NL/min;
3, LF stove refining operation
Ensureing under the prerequisite that electric arc arc stream is stable; adopt strong mixing process; argon flow amount is 255NL/min; liquid steel temperature is 1585 DEG C, and at the end of refining, in steel, Fe content is 0.40%, does not reach the lower limit of steel grade requirement Fe content; steel grade lower limit Fe content is 0.45%; therefore add manganeseirom 150kg and adjust, add other alloy adjustment molten steel component simultaneously and meet steel grade requirement, molten steel terminal composition is: C:0.14%; Si:0.20%; Mn:0.50%; P:0.025%; S:0.015%.
The final recovery rate analyzing manganese in manganese ore after testing reaches 93%.
Claims (2)
1. the technique containing manganese alloy, it is characterized in that comprising: 1) ladle baking---the manganese ore block that selection particle diameter 10-50mm, phosphorus sulphur content are all less than 0.05% weight percent adds in ladle, by limit in institute's steelmaking kind requirement Fe content with addition of, but must not more than 20kg/ ton steel, baking temperature of steel ladle is greater than 1000 DEG C, and keep more than 2 hours, and in the transmitting procedure after ladle baking, top capped steel clad; 2) converter operation---tapping temperature according in operation or work standard, the upper limit perform, liquid steel temperature controls between 1685 ~ 1705 DEG C, ensure that in ladle, liquid steel temperature is not less than 1670 DEG C, endpoint carbon content controls more than 0.08%, the quantity of slag under control converter, slag is thick in 50mm, after tapping terminates, carries out the operation of ladle bottom blowing argon gas; 3) LF stove refining operation---adopt strong mixing process, argon flow amount is not less than 250NL/min, and temperature controls according to the refining target temperature upper limit, adds other alloy adjustment molten steel component simultaneously and meets steel grade requirement.
2., according to claim 1 containing the technique of manganese alloy, when when it is characterized in that described LF stove refining operation, in steel, Fe content is lower than steel grade requirement, add including Mn-Fe alloy and adjust, Fe content press the control of steel grade lower limit.
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| CN105838843A (en) * | 2016-05-10 | 2016-08-10 | 新疆八钢铁股份有限公司 | Technology for applying manganese ore to converter steelmaking in directly-alloying manner |
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